Segmentation Fault after 2.0.16 upgrade from 2.0rc2

Hi, after upgrading to 2.0.16 on Centos 4, I now receive a Segmentation fault every time I click on either a post link or a category link. Disaster! If any gurus spot any obvious issues with my setup below I would really appreciate hearing about it.

Or even just any pointers on where to start looking. Many thanks.

Relevant PHP Info bits:

PHP Version 5.2.14

Configuration
PHP Core
Directive Local Value Master Value
allow_call_time_pass_reference Off Off
allow_url_fopen On On
allow_url_include Off Off
always_populate_raw_post_data Off Off
arg_separator.input & &
arg_separator.output & &
asp_tags Off Off
auto_append_file no value no value
auto_globals_jit On On
auto_prepend_file no value no value
browscap no value no value
default_charset no value no value
default_mimetype text/html text/html
define_syslog_variables Off Off
disable_classes no value no value
disable_functions no value no value
display_errors On On
display_startup_errors On On
doc_root no value no value
docref_ext no value no value
docref_root no value no value
enable_dl On On
error_append_string no value no value
error_log no value no value
error_prepend_string no value no value
error_reporting 6135 6135
expose_php On On
extension_dir /usr/lib/php/modules /usr/lib/php/modules
file_uploads On On
highlight.bg #FFFFFF #FFFFFF
highlight.comment #FF8000 #FF8000
highlight.default #0000BB #0000BB
highlight.html #000000 #000000
highlight.keyword #007700 #007700
highlight.string #DD0000 #DD0000
html_errors On On
ignore_repeated_errors Off Off
ignore_repeated_source Off Off
ignore_user_abort Off Off
implicit_flush Off Off
include_path .:/php/includes:/usr/share/php:/usr/share/pear .:/php/includes:/usr/share/php:/usr/share/pear
log_errors On On
log_errors_max_len 1024 1024
magic_quotes_gpc On On
magic_quotes_runtime Off Off
magic_quotes_sybase Off Off
mail.force_extra_parameters no value no value
max_execution_time 60 60
max_file_uploads 20 20
max_input_nesting_level 64 64
max_input_time 90 90
memory_limit 64M 64M
open_basedir no value no value
output_buffering 4096 4096
output_handler no value no value
post_max_size 16M 16M
precision 14 14
realpath_cache_size 16K 16K
realpath_cache_ttl 120 120
register_argc_argv On On
register_globals On On
register_long_arrays On On
report_memleaks On On
report_zend_debug On On
safe_mode Off Off
safe_mode_exec_dir no value no value
safe_mode_gid Off Off
safe_mode_include_dir no value no value
sendmail_from no value no value
sendmail_path /usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i
serialize_precision 100 100
short_open_tag On On
SMTP localhost localhost
smtp_port 25 25
sql.safe_mode Off Off
track_errors Off Off
unserialize_callback_func no value no value
upload_max_filesize 16M 16M
upload_tmp_dir no value no value
user_dir no value no value
variables_order EGPCS EGPCS
xmlrpc_error_number 0 0
xmlrpc_errors Off Off
y2k_compliance On On
zend.ze1_compatibility_mode Off Off

Apache Environment
Variable Value
force-no-vary 1
SCRIPT_URL /phpinfo.php
SITE_ROOT /home/virtual/site1/fst
SITE_HTMLROOT /home/virtual/site1/fst/var/www/html
SITE_CGIROOT /home/virtual/site1/fst/var/www/cgi-bin
SITE_PERL /home/virtual/site1/fst/var/www/perl
HTTP_ACCEPT */*
HTTP_ACCEPT_LANGUAGE en-GB
HTTP_USER_AGENT Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; GTB6.6; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MATM)
HTTP_ACCEPT_ENCODING gzip, deflate
HTTP_CONNECTION Keep-Alive
HTTP_COOKIE Vanilla-Volatile=1-1293965017%7C2d2078ba6729e8640d5475d1509a6451%7C1293792217%7C1%7C1293965017; __utmc=201831821
PATH /sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin
SERVER_SIGNATURE no value
SERVER_SOFTWARE Apache
SERVER_PORT 80
DOCUMENT_ROOT /home/virtual/site1/fst/var/www/html
SCRIPT_FILENAME /home/virtual/site1/fst/var/www/html/phpinfo.php
REMOTE_PORT 51737
GATEWAY_INTERFACE CGI/1.1
SERVER_PROTOCOL HTTP/1.1
REQUEST_METHOD GET
QUERY_STRING no value
REQUEST_URI /phpinfo.php
SCRIPT_NAME /phpinfo.php
force-response-1.0 1

curl
cURL support enabled
cURL Information libcurl/7.12.1 OpenSSL/0.9.7a zlib/1.2.1.2 libidn/0.5.6

gd
GD Support enabled
GD Version bundled (2.0.34 compatible)
FreeType Support enabled
FreeType Linkage with freetype
FreeType Version 2.1.9
GIF Read Support enabled
GIF Create Support enabled
JPG Support enabled
PNG Support enabled
WBMP Support enabled
XPM Support enabled
XBM Support enabled

mysql
MySQL Support enabled
Active Persistent Links 0
Active Links 0
Client API version 5.1.30
MYSQL_MODULE_TYPE external
MYSQL_SOCKET /var/lib/mysql/mysql.sock
MYSQL_INCLUDE -I/usr/include/mysql
MYSQL_LIBS -L/usr/lib/mysql -lmysqlclient

mysqli
MysqlI Support enabled
Client API library version 5.1.30
Client API header version 5.1.49
MYSQLI_SOCKET /var/lib/mysql/mysql.sock

PDO
PDO support enabled
PDO drivers mysql, odbc, pgsql, sqlite, sqlite2


pdo_mysql
PDO Driver for MySQL, client library version 5.1.30


PDO_ODBC
PDO Driver for ODBC (unixODBC) enabled
ODBC Connection Pooling Enabled, strict matching


pdo_pgsql
PDO Driver for PostgreSQL enabled
PostgreSQL(libpq) Version 7.4.29
Module version 1.0.2
Revision $Id: pdo_pgsql.c 293036 2010-01-03 09:23:27Z sebastian $


pdo_sqlite
PDO Driver for SQLite 3.x enabled
PECL Module version 1.0.1 $Id: pdo_sqlite.c 293036 2010-01-03 09:23:27Z sebastian $
SQLite Library 3.3.13